Sharing regrets about how the affair had secretly developed, Jess admitted both she and Dan were "swept up in this bubble of lies and manipulation" and are now dealing with feelings of guilt and shame.

"I feel horrible about Tamara," she confessed. "I trashed girl code and I was disgusting."

Tamara and Dan listen to Jess and Mick's marriage issues. (Nine)

This Sunday's commitment ceremony promises to blow the affair wide open, with talks of Jess and Dan ditching their current partners and restarting the experiment together.

Whatever they end up choosing to do, it's clear the pair have caught some serious feels, and aren't slowing down any time soon.

"I'm definitely in love, yeah I definitely am," Jess gushed during her Talking Married appearance.

"It's been reciprocated from Dan that he is also, and I think we fell really easily for one another. That was why I was able to take that step, I knew that I was hurting people… but I can't take it back because I feel that it was worth it."

See what happens during the impending tell-all commitment ceremony when Married at First Sight continues this Sunday on Nine at 7pm.

For more exclusives, tune in to 9Life every Wednesday at 9.00pm, right after MAFS.

You can also stream episodes of MAFS and Talking Married for free on9Now.